Method for optimizing monocrystalline-silicon pyramid-structured textured face

Abstract

The invention discloses a method for optimizing a monocrystalline-silicon pyramid-structured textured face. The method is characterized in that ozone gas is introduced into a pickling acid mixing tankof alkali texturing equipment, thus, the flow rate of ozone can be controlled in an ozone introducing manner so as to effectively control the content of ozone in the tank and better achieve an oxidation action, and meanwhile, the acid mixing tank plays a role in neutralizing residual alkali and removing metal ions. According to the method, the ozone of certain concentration is introduced into thepickling acid mixing tank of the alkali texturing equipment, thus, the action of neutralizing the residual alkali and removing the metal ions of the traditional pickling tank can be exerted, and a microstructure of a monocrystalline pyramid textured face can be optimized. Thus, the uniformity of a diffused PN junction and the uniformity of sheet resistance can be effectively improved, the effectof cleaning organic matters and metal ions from surfaces of silicon wafers is improved, the front face passivating effect is improved, and thus, the conversion efficiency of cell sheets is increased.

Description

technical field

[0001] This patent belongs to the field of photovoltaic technology, and specifically relates to the alkali texturing process in the manufacturing process of single crystal solar cells. Background technique

[0002] In recent years, with the continuous development of solar cell technology, not only the efficiency of cells in the research field has continuously broken through and hit new highs, but also in industrial production, the production scale of solar cells has also continued to expand. In order to obtain higher conversion efficiency and reduce production costs, technicians in the solar energy industry continue to innovate the process technology, which gradually reduces the photovoltaic on-grid electricity price, and finally gradually replaces fossil energy.

[0003] Texturing the surface of monocrystalline silicon solar cells is one of the key technologies for producing high-efficiency monocrystalline silicon solar cells, which is conducive to reducing ...

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